code: def test_item_data(self):
      train_set = Dataset.from_uir(self.triplet_data)
  
      self.assertEqual(len(train_set.item_data), 10)
      self.assertListEqual(train_set.item_data[0][0], [0])
      self.assertListEqual(train_set.item_data[0][1], [4.0])
  
imports: import unittest
  import numpy
  import numpy.testing
  from cornac.data import BasketDataset, Dataset, SequentialDataset, Reader
label_desc: Use image node_id 13 for calling the TestDataset obj's underlying member method code with example usage: obj.test_item_data() without return types